Horseshoe.



J. A. LARSON.

HORSESHOE.

APPLICATION IILBD OCT. 2; 1912.

Patented Aug. 26, 1913.

INVENTOR fi/lfl Lav-J00 WITNESSES.

, A TTORNEY UNITED STATES PATENT OFFICE.

JOHN A. LARSON, OF TACOMA, WASHINGTON.

HORSESI-IOE.

To all whom it may concern:

Be it known that I, JOHN A. LARSON, a citizen of Sweden, residing at Tacoma, in the county of Pierce and State of VVashington, have invented a new and useful I1nprovement in Horseshoes, of which the following is a specification.

This invention relates to horse shoes and especially to the calks thereof, and one of its objects is to provide means whereby the toe and heel calks are secured to the shoe and yet may be quickly removed and replaced when they become worn without having to remove the shoe from the hoof. I attain this and other objects by the devices and arrangements illustrated in the accompanying drawings, in Wl1lCl1- Figure 1 is a bottom plan of my improved horse shoe equipped with the toe calk and one heel calk, the other heel being shown with the call; omitted; Fig. 2 is a similar view of the toe portion of the shoe with the calk removed therefrom; Fig. 3 is a similar View of the same part showing the toe calk being placed in position; Fig. 4: is a vertical section on the line 4-4lin Fig. 1; Fig. 5 is a similar section on the line 5 5 in Fig. 1; Fig. 6 is a similar section on the line 66 in Fig. 1, the portion of the heel calk being shown in side elevation; Fig. 7 is a similar section on the line 7--7 in Fig. 1, the heel calk being shown in rear elevation however; and Fig. 8 is a top plan of the heel of the shoe, the heel calk having been removed from thereunder.

Similar numerals of reference refer to similar parts throughout the several views.

The toe calk of the hereinafter described horse shoe is different in form and structure from the heel calks but the heel calks are similar to each other and are interchangeable. Referring first to the toe calk, illustrated particularly in. Figs. 1 to 5: the horse shoe 1 is provided with a pair of curved grooves 2 on its sole or under surface, said grooves being'parts of a single circle whose center is at the center of the toe of the shoe. A center plate 3 is secured to the sole or under side of the shoe 1, between the grooves 2 therein, said plate being formed of a portion of a circle with its front and rear sides cut straight across so as to have a lesser distance across the plate from front to rear than from side to side, and the diameter of said plate from side to side being greater than the diameter joining the inner or ad- Specification of Letters Patent.

Application filed October 2, 1912.

Patented Aug. 26, 1913. Serial No. 723,478.

jacent walls of the grooves 2 so that said plate 3 will extend over said grooves, but being of lesser diameter than the diameter joining the outer walls of said grooves. Two plates 41 are also secured to the sole or under side of the shoe 1, one to each side of the plate 3 and spaced therefrom by a short distance. The sides of said plates a which are adjacent to the plates 3 are cut on circles concentric therewith and of lesser diameter than the diameter between the outer walls of said grooves 2 so that said plates 4 will project over the grooves 2. Thus is formed the foundation for the toe calk and a countersunk circular cavity for holding it in place.

The toe call: consists of the calk projection 5 which extends down from the shoe sole and is shaped to cut into the surface on which the horse is moving to give it a firm pulling hold thereon, and a pair of complementary circular lugs 6 extending up from the base of the part 5 and having lateral enlargements 7 on their upper ends. These lugs are so spaced and curved that they fit in the space between the plates 3 and 4; and pass therethrough, the enlargements or feet 7 thereof entering the grooves 52 and engaging the portions of the plates 3 and l which extend over the said grooves. The parts 6 and 7 are preferably broader than the base of the part 5. As seen in Fig. 3, the parts are so proportioned that the inner points of the parts 7 will be spaced farther apart than the thickness or breadth of the shoe or the width of the plate 3, thus enabling the said parts to slip therepast when the calk is at right angles to its normal position to bring the said parts into line with the spaces in which they fit. The toe calk is inserted in place by first holding it at right angles to its normal position (Fig. 3) and then passing its lugs in front of and to the rear of the toe of the shoe until the base of the part 5 engages the plate 3, and then turning it around the central axis, bringing the parts 6 and 7 into engagement with the circular cavities formed to receive them, until it occupies its normal position which will be substantially at right angles to the axis of the shoe (Fig. 1). The exposed corners of the parts 7 may then be slightly bent with a hammer to prevent the calk from accidentally turning farther on the axis.

Referring now to Figs. 1, 6, 7 and 8, it will be seen that the heel calk is different from the toe calk in some of its details.

Each heel 8 of the shoe is provided with a hole 9 passing vertically through it and with a pair of vertical slots 10 communicating with the said holes 9, and with a circular recess 11 on the upper or hoof side of the shoe, said recess being concentric with the hole 9 and of a diameter equal to the cliameter across the said pair of slots 10 (Fig. 8). A central bearing plate 12 is secured to the sole side of the shoe surrounding the said hole 9 and having a hole and slots cut therein corresponding with and continuing the said hole 9 and slots 10. A circular groove 13 is cut in the under side of the heel in front of and concentric with the hole 9. A plate 14 is secured to the under side of the shoe in front of and extending part way over the said groove 13, the rear edge of said plate being formed on a curve concentrio with the hole 9 and groove 13. Thus is formed the foundation for the heel calk and a countersunk circular cavity for holding it in place. The heel calk consists of a projection 15 which extends down from the heel of the shoe and which is sharpened to securely engage the surface on which the horse is pulling, a front lug 16 which extends into the groove 13 and engages the overhanging portion of the plate 14: to take the backward strain on the part 15, and a central pin 17 which fits in the hole 9, extending upward therethrough and having two lugs 18 extending from its sides and which engage the shoe in the recess 11. The

calk is inserted by placing it at right angles to its normal position and passing the pin 17 through the hole 9, the lugs 18 passing along the slots 10, until the base engages the plate 12 at which point the lugs 18 have reached the level of the recess 11 and the lug 16 has reached the level of the groove 13; then the calk is turned in the hole 9 to its normal position (Figs. 1, 6 and 7), when the lug 16 engages the groove 13 and the lugs 18 engage in the recess 11, thus holding the calk in position. The corners of the plate 14 may be slightly bent with a hammer to keep the calk from turning.

Having described my invention, what I claim is 1. In a horse shoe, the combination of a body portion to be fastened to the hoof, and having a circular-curved groove formed in its under surface; a plate secured to the under surface of the shoe on the outward side of said groove, and having one edge extending inward over the groove and formed concentric with the .groove; a calk having its center concentric with said groove; a lug formed on said calk and engaging said groove and the overhanging portion of said plate; and means formed on the calk and engaging the shoe to cooperate with said engaging lug and groove to confine to a rotary motion the possible motion of the calk relatively to the shoe.

2. In a horse shoe, the combination of a body port-ion to be fastened to the hoof, and having a circular-curved groove formed in its under surface; a plate secured to the under surface of the shoe on the inward side of said groove; a second plate secured to the under surface of said shoe on the outward side of said groove, the adjacent edges of said two plates being spaced apart and concentric with said groove, said second plate extending inward over the groove; a calk having its center concentric with said groove; a lug formed on said calk and engaging said groove and the overhanging portion of said plate; and means formed on the calk and engaging the shoe to cooperate with said engaging lug and groove to confine to a rotary motion the possible motion of the calk relatively to the shoe.

3. In a horse shoe, the combination of a body portion to be fastened to the hoof, and having circular-curved grooves formed in its under surface; plates secured to the under surface of the shoe to each side of each of said grooves, and having their adjacent edges spaced apart and concentric with said grooves, the outer of said plates extending over the grooves; calks having their centers concentric with said grooves; lugs formed on said calks and engaging sai grooves and the overhanging portions of said outer plates; and means formed on the calks and engaging the shoe to cooperate with said engaging lugs and grooves to confine to a rotary motion the possible motion of the calk relatively to the shoe.

JOHN A. LARSON.

WVitnesses:

M. F. MGNEIL, J. BROWN.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

